Evacuated Tube
Solar Hot Water Heater

Evacuated tube is a solar collector for water heating that
uses a vacuum glass tubes to absorb heat from the sun. These single
collectors have two layers of glass, joined together, absorbing film,
and vacuum between to prevent a heat loss from the absorber.

These single solar tubes are combined into
groups, supported by the frame
and
manifold or water tank at the top.

Evacuated solar tubes are usually
connected to the
manifold in a
way to allow easy installation and replacement (plug-and-play
principle).

The main advantage of evacuated solar tube water
heater is the
ability to heat the water even during the cloudy days. Because of its
cylindrical shape, the evacuated tube is facing the sun all the time
and therefore is more efficient than other solar water
heaters. As long as the sun shines the evacuated solar tube hot water
heater
can be in service all year round.

You can use this system even in cold climate, as the selective
coating
and vacuum layer prevents heat loss and ensures high energy absorption.

Since the heat pipes transfer
heat in one direction only and within the collector, over
92% of the heat is absorbed and less than 8% is heat loss.

How it works

Pressurized
Solar Water Heater with Vacuum Glass Tubes and Heat Pipes

When the evacuated solar tube is exposed to the sun, it absorbs the
heat. The
heat tube
located within the evacuated glass tube gets warmer and the liquid
(alcohol, acetone) in the heat tube quickly turns to hot vapor.

The steam, or hot vapor rises to the top of the heat pipe.
Cold water
or
glycol that flows through the manifold picks up the heat.

The fluid in the heat pipe gets colder and condenses (turns
into
liquid)
and goes down
to the base of the heat pipe. The cycle starts all over again and
continues till solar tube system has enough sunlight or diffuse
light. Recommended
tilt angle
should be maintained.

By Application

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